Search for the Samyang 85/1.4. They're all made by the same company. IIRC, the consensus is that it isn't as nice as say the Nikon 85/1.4, but for the price, its a pretty good lens. The major flaw seemed to be occasionally excessive CA.
Here you have a pic, no post-processed at all, only cropped. I think the lens is exelent for the price. This pic was taken with canon 5d mkII (full frame) the camera reports it as 50mm. To make manual focus easier you should change the focusing screen, in the case of 5Dmkii I bought the Eg-5
I believe there has been some issues with the Nikon mount version and the auto-aperture stop down linkage... No concern really for the Canon mount version as it is completely manual/stop down aperture control.
First shot with mine, quite sharp wide open (some sharpness added).
Pretty pleased with it although even with an eyepiece magnifier wide open focusing is almost impossible.
No problem using live view @ 5x though.
Eventually i'll get a focus screen.